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ATI Radeon HD 4870 X2

R700 x2
Graphics Processor
800 x2
Cores
40 x2
TMUs
16 x2
ROPs
1024 MB x2
Memory Size
GDDR5
Memory Type
256 bit x2
Bus Width
ATI Radeon HD 4870 X2 Photo ATI R700 Photo
The Radeon HD 4870 X2 was a high-end graphics card by ATI, launched in August 2008. Built on the 55 nm process, and based on the R700 graphics processor, in its R700 XT variant, the card supports DirectX 10.1. The R700 graphics processor is an average sized chip with a die area of 256 mm² and 956 million transistors. Radeon HD 4870 X2 combines two graphics processors to increase performance. It features 800 shading units, 40 texture mapping units and 16 ROPs per GPU. ATI has placed 2,048 MB GDDR5 memory on the card, which are connected using a 256-bit memory interface per GPU (each GPU manages 1,024 MB). The GPU is operating at a frequency of 700 MHz, memory is running at 900 MHz.
Being a dual-slot card, the ATI Radeon HD 4870 X2 draws power from 1x 6-pin + 1x 8-pin power connectors, with power draw rated at 286 W maximum. Display outputs include: 2x DVI, 1x S-Video. Radeon HD 4870 X2 is connected to the rest of the system using a PCI-Express 2.0 x16 interface. The card measures 267 mm in length, and features a dual-slot cooling solution. Its price at launch was 550 US Dollars.

Graphics Processor

GPU Name
R700
GPU Variant
R700 XT
(215-0669045)
Architecture
TeraScale
Process Size
55 nm
Transistors
956 million
Die Size
256 mm²

Graphics Card

Release Date
Aug 12th, 2008
Generation
Radeon R700
(HD 4800)
Production
End-of-life
Launch Price
550 USD
Bus Interface
PCIe 2.0 x16

Relative Performance

6%
7%
9%
11%
13%
14%
17%
23%
23%
25%
26%
27%
31%
33%
35%
36%
38%
39%
42%
44%
45%
46%
48%
55%
55%
56%
57%
57%
57%
58%
61%
64%
66%
68%
69%
69%
70%
70%
70%
72%
75%
76%
82%
84%
84%
87%
87%
90%
96%
99%
100%
Radeon HD 4870 X2
102%
102%
106%
107%
108%
110%
115%
117%
119%
119%
119%
120%
129%
131%
134%
135%
136%
137%
137%
140%
140%
144%
155%
159%
163%
164%
166%
167%
171%
176%
180%
184%
187%
187%
207%
228%
231%
246%
248%
251%
254%
257%
258%
261%
263%
264%
266%
280%
286%
290%
290%
319%
324%
330%
355%
389%
403%
434%
434%
458%
536%
550%
599%
682%
Based on TPU review data: "Performance Summary" at 1920x1080

Clock Speeds

GPU Clock
700 MHz
Memory Clock
900 MHz
3600 MHz effective

Memory

Memory Size
1024 MB
Memory Type
GDDR5
Memory Bus
256 bit
Bandwidth
115.2 GB/s

Render Config

Shading Units
800
TMUs
40
ROPs
16
Compute Units
10

Theoretical Performance

Pixel Rate
11.20 GPixel/s
Texture Rate
28.00 GTexel/s
FP32 (float) performance
1,120 GFLOPS
FP64 (double) performance
224.0 GFLOPS (1:5)

Board Design

Slot Width
Dual-slot
Length
10.5 inches
267 mm
TDP
286 W
Outputs
2x DVI
1x S-Video
Power Connectors
1x 6-pin + 1x 8-pin
Board Number
B509

Graphics Features

DirectX
10.1
OpenGL
3.3
OpenCL
1.1
Vulkan
N/A
Shader Model
4.1

Card Notes

This is a dual GPU card that features two RV770XT chips and a PCI-E lane arbiter chip made by PLX. The card features a total of 2 GB GDDR5 memory.

R700 GPU Notes

Graphics/Compute: GFX3
Display Core Engine: 3.1
Unified Video Decoder: 2.0

Retail boards based on this design (5)

Name GPU Clock Memory Clock Other Changes
ASUS HD 4870 X2 TOP 790 MHz 915 MHz
Gainward Rampage700 GS 750 MHz 950 MHz Triple-slot, 1x DVI 1x HDMI 1x DisplayPort 1x VGA
Gainward Rampage700 GS GLH 790 MHz 950 MHz Triple-slot, 1x DVI 1x HDMI 1x DisplayPort 1x VGA
Sapphire HD 4870 X2 750 MHz 900 MHz
Sapphire HD 4870 X2 ATOMIC 800 MHz 1000 MHz Single-slot